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+/* ----------------------------------------------------------------------
+ * Project: CMSIS DSP Library
+ * Title: arm_absmax_f32.c
+ * Description: Maximum value of absolute values of a floating-point vector
+ *
+ * $Date: 23 April 2021
+ * $Revision: V1.9.0
+ *
+ * Target Processor: Cortex-M and Cortex-A cores
+ * -------------------------------------------------------------------- */
+/*
+ * Copyright (C) 2010-2021 ARM Limited or its affiliates. All rights reserved.
+ *
+ * SPDX-License-Identifier: Apache-2.0
+ *
+ * Licensed under the Apache License, Version 2.0 (the License); you may
+ * not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an AS IS BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#include "dsp/statistics_functions.h"
+#if (defined(ARM_MATH_NEON) || defined(ARM_MATH_MVEF)) && !defined(ARM_MATH_AUTOVECTORIZE)
+#include <limits.h>
+#endif
+
+/**
+ @ingroup groupStats
+ */
+
+/**
+ @defgroup AbsMax Absolute Maximum
+
+ Computes the maximum value of absolute values of an array of data.
+ The function returns both the maximum value and its position within the array.
+ There are separate functions for floating-point, Q31, Q15, and Q7 data types.
+ */
+
+/**
+ @addtogroup AbsMax
+ @{
+ */
+
+/**
+ @brief Maximum value of absolute values of a floating-point vector.
+ @param[in] pSrc points to the input vector
+ @param[in] blockSize number of samples in input vector
+ @param[out] pResult maximum value returned here
+ @param[out] pIndex index of maximum value returned here
+ @return none
+ */
+#if defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE)
+
+#include "arm_helium_utils.h"
+
+void arm_absmax_f32(
+ const float32_t * pSrc,
+ uint32_t blockSize,
+ float32_t * pResult,
+ uint32_t * pIndex)
+{
+ int32_t blkSize = blockSize;
+ f32x4_t vecSrc;
+ f32x4_t curExtremValVec = vdupq_n_f32(F32_ABSMIN);
+ float32_t maxValue = F32_ABSMIN;
+ uint32_t idx = blockSize;
+ uint32x4_t indexVec;
+ uint32x4_t curExtremIdxVec;
+ uint32_t curIdx = 0;
+ mve_pred16_t p0;
+
+
+ indexVec = vidupq_wb_u32(&curIdx, 1);
+ curExtremIdxVec = vdupq_n_u32(0);
+
+ do {
+ mve_pred16_t p = vctp32q(blkSize);
+
+ vecSrc = vldrwq_z_f32((float32_t const *) pSrc, p);
+ vecSrc = vabsq_m(vuninitializedq_f32(), vecSrc, p);
+ /*
+ * Get current max per lane and current index per lane
+ * when a max is selected
+ */
+ p0 = vcmpgeq_m(vecSrc, curExtremValVec, p);
+ curExtremValVec = vpselq(vecSrc, curExtremValVec, p0);
+ curExtremIdxVec = vpselq(indexVec, curExtremIdxVec, p0);
+
+ /* Does TP detection works here ?? */
+ indexVec = vidupq_wb_u32(&curIdx, 1);
+
+ blkSize -= 4;
+ pSrc += 4;
+ }
+ while (blkSize > 0);
+
+ /*
+ * Get max value across the vector
+ */
+ maxValue = vmaxnmvq(maxValue, curExtremValVec);
+ /*
+ * set index for lower values to max possible index
+ */
+ p0 = vcmpgeq(curExtremValVec, maxValue);
+ indexVec = vpselq(curExtremIdxVec, vdupq_n_u32(blockSize), p0);
+ /*
+ * Get min index which is thus for a max value
+ */
+ idx = vminvq(idx, indexVec);
+ /*
+ * Save result
+ */
+ *pIndex = idx;
+ *pResult = maxValue;
+}
+
+
+#else
+#if defined(ARM_MATH_LOOPUNROLL)
+void arm_absmax_f32(
+ const float32_t * pSrc,
+ uint32_t blockSize,
+ float32_t * pResult,
+ uint32_t * pIndex)
+{
+ float32_t cur_absmax, out; /* Temporary variables to store the output value. */\
+ uint32_t blkCnt, outIndex; /* Loop counter */ \
+ uint32_t index; /* index of maximum value */ \
+ \
+ /* Initialize index value to zero. */ \
+ outIndex = 0U; \
+ /* Load first input value that act as reference value for comparision */ \
+ out = *pSrc++; \
+ out = (out > 0.0f) ? out : -out; \
+ /* Initialize index of extrema value. */ \
+ index = 0U; \
+ \
+ /* Loop unrolling: Compute 4 outputs at a time */ \
+ blkCnt = (blockSize - 1U) >> 2U; \
+ \
+ while (blkCnt > 0U) \
+ { \
+ /* Initialize cur_absmax to next consecutive values one by one */ \
+ cur_absmax = *pSrc++; \
+ cur_absmax = (cur_absmax > 0.0f) ? cur_absmax : -cur_absmax; \
+ /* compare for the extrema value */ \
+ if (cur_absmax > out) \
+ { \
+ /* Update the extrema value and it's index */ \
+ out = cur_absmax; \
+ outIndex = index + 1U; \
+ } \
+ \
+ cur_absmax = *pSrc++; \
+ cur_absmax = (cur_absmax > 0.0f) ? cur_absmax : -cur_absmax; \
+ if (cur_absmax > out) \
+ { \
+ out = cur_absmax; \
+ outIndex = index + 2U; \
+ } \
+ \
+ cur_absmax = *pSrc++; \
+ cur_absmax = (cur_absmax > 0.0f) ? cur_absmax : -cur_absmax; \
+ if (cur_absmax > out) \
+ { \
+ out = cur_absmax; \
+ outIndex = index + 3U; \
+ } \
+ \
+ cur_absmax = *pSrc++; \
+ cur_absmax = (cur_absmax > 0.0f) ? cur_absmax : -cur_absmax; \
+ if (cur_absmax > out) \
+ { \
+ out = cur_absmax; \
+ outIndex = index + 4U; \
+ } \
+ \
+ index += 4U; \
+ \
+ /* Decrement loop counter */ \
+ blkCnt--; \
+ } \
+ \
+ /* Loop unrolling: Compute remaining outputs */ \
+ blkCnt = (blockSize - 1U) % 4U; \
+ \
+ \
+ while (blkCnt > 0U) \
+ { \
+ cur_absmax = *pSrc++; \
+ cur_absmax = (cur_absmax > 0.0f) ? cur_absmax : -cur_absmax; \
+ if (cur_absmax > out) \
+ { \
+ out = cur_absmax; \
+ outIndex = blockSize - blkCnt; \
+ } \
+ \
+ /* Decrement loop counter */ \
+ blkCnt--; \
+ } \
+ \
+ /* Store the extrema value and it's index into destination pointers */ \
+ *pResult = out; \
+ *pIndex = outIndex;
+}
+#else
+void arm_absmax_f32(
+ const float32_t * pSrc,
+ uint32_t blockSize,
+ float32_t * pResult,
+ uint32_t * pIndex)
+{
+ float32_t maxVal, out; /* Temporary variables to store the output value. */
+ uint32_t blkCnt, outIndex; /* Loop counter */
+
+
+
+ /* Initialise index value to zero. */
+ outIndex = 0U;
+
+ /* Load first input value that act as reference value for comparision */
+ out = fabsf(*pSrc++);
+
+ /* Initialize blkCnt with number of samples */
+ blkCnt = (blockSize - 1U);
+
+
+ while (blkCnt > 0U)
+ {
+ /* Initialize maxVal to the next consecutive values one by one */
+ maxVal = fabsf(*pSrc++);
+
+ /* compare for the maximum value */
+ if (out < maxVal)
+ {
+ /* Update the maximum value and it's index */
+ out = maxVal;
+ outIndex = blockSize - blkCnt;
+ }
+
+ /* Decrement loop counter */
+ blkCnt--;
+ }
+
+ /* Store the maximum value and it's index into destination pointers */
+ *pResult = out;
+ *pIndex = outIndex;
+}
+#endif /* defined(ARM_MATH_LOOPUNROLL) */
+#endif /* defined(ARM_MATH_MVEF) && !defined(ARM_MATH_AUTOVECTORIZE) */
+/**
+ @} end of AbsMax group
+ */
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